Crank-axle lathe.



J. L. BOGERT.

CRANK AXLE LATHE.

APPLICATION FILED SEPT. 9, 1904.

Patented May 4, 1909.

5 SHEETS-SHEET 1.

J. L. BOGERT.

CRANK AXLE LATHE. AiPLIOATION FILED SEPT;9,1904.

920,420. Patented May 4, 1909.

811 we 11 lb;

5 SHEETS-SHEET 2.

J. L. BOGERT.

GRANK AXLE LATHE.

APPLIOATION FILED SEPT. 9,1904.

920,420. Patented May 4, 1909.

5 SHEETS-SHEET 3.

k vneu I J. L. BOGERT.

CRANK AXLE LATHE. APPLIOATION PILBDSBPT.9,1904.

920,420, Patented May 4, 1909.

5 SHEETS-SHBET 4.

M 51:00! I l'oz J. L. BOGERT CRANK AXLE LATHE.

APPLICATION FILED SEPT.9,1904.

920,420; Patented May 4, 19 9.

5 SHEETSSHEET 5.

JOHN L. BOGERT, OF NEW YORK, N. Y.

CRANK-AXLE LATHE Specification of Letters Patent.

Patented May 4, 1909.

Application filed September 9, 1904. Serial No. 223,903.

To all whom it may concern:

Be it known that 1, JOHN L. Boonn'r, a citizen of the United States, and residing in New York city, borough of Queens, New York, have invented certain new and useful Improvements in Crank-Axle Lathes, of which the following is a specification.

My invention relates to improvements in crank axle lathes of the class shown in U. S. Letters Patent No. 568,063, granted to me September 22, 1896, and in the lathe l have illustrated in the accompanying drawings provision is made for operating upon multiple-pin crank shafts, such as used in gas engines.

One of the objects of my invention is to provide such a lathe or machine wherein the cylindrical bearing surfaces of a crank axle, including the crank pin or pins, 'carrbe economically turned or cut to their proper dimensions.

Another object of the invention is to provide means for permitting rapid and accurate chucking of the crank axle, whereby its point of application of rotational strain and transverse support may always be close to the thrust of the cutting tool or mill.

A further object of the invention is to provide a novel tool support, so arranged that the tool can be brought close to the crank pin or bearing while rigidly held.

The invention consists in a lathe having a head-stock whose spindle carries a chuck arranged to firmly grasp the end of the crank axle so that either the main bearing portions of the axle or the crank pins thereof may be accurately centered for turning or cutting, and a rotating wheel mounted in a bearing frame or case that is adjustable along the bed of the machine toward and from the head-stock and which carries a chuck to firmly grasp the arm of a crank, said chuck and the head-stock chuck being geared together for rotation in absolute simultaneousness. By thus having the angular velocity of the spindle chuck and the rotating-wheel chuck always the same, a true cylindrical surface will be produced by a cutting edge parallel to the axis of rotation. in the case of turning the crank pin or pins,

it is only necessary that both of said chucks shall be eccentric the amount of the throw of the crank, and both chucks are therefore so constructed that they may firmly hold the crank shaft in two positionseither the axis of the shaft itself or the axis of the crank pin coinciding with the axis of rotation of the lathe spindle.

The invention further consists in a tool supportcomprising a sheet of metal made narrow or thin enough to pass between the arms of a crank, extended sufficiently in length and breadth to secure suitable support against buckling strains, and adapted to carry the mill or tool on the edge that passes nearest to the axis of rotation of the axle or a crank pin.

The invention further consists in the novel construction of chucks, one adapted for the end of a head-stock spindle to grasp the crank shaft proper both concentrically and eccentrically of the main spindle according as a shaft bearing. or a crank pin .is to be operated upon, and the other for said rotating wheel adapted to grasp an arm of a crank so that a-shaft bearing or crank pin axis may be concentric with the axis of rotation of the main spindle at the will of the operator.

The invention further comprises the novel details of improvement that will be more fully hereinafter set forth and then pointed out in the claims.

Reference is to be had to the accompanying drawings forming part hereof, wherein,

Figure 1 1s a side elevation of a crank axle lathe embodying my improvements, showing the arts in position for milling one of the cran pins of a four throw crank shaft, Fig. 2 is a detail view looking at the front of the main spindle chuck, Fig. 2 is an edge view thereof, Fig. 2 is a sectional detail thereof Fig. 3 is a detail face View of a rotating wheel and its chuck for grasping a crank arm, Fig. 4 is a central section thereof, Fig. 5 is a detail section throu h the bolt, Fig. 6 is a detail cross section t rough the main bed, showing a cross slide and milling tool, Fig. 7 is a plan view thereof, Fig. 8 is a detail face view of part of the tool carriage, Fig. 9 is a substantially similar view showing a modification, Fig. 10 is a cross section through the main bed, at right angles to Fig. 9, Fig. 11 is a detail view showing a modification of the arrangements of the milling tool and its support, Fig. 12 is a detail face view of the main rotative wheel, showing a modification of the chuck, Fig. 13 is a vertical section thereof, Fig. 1 1 is a horizontal section of Fig. 12, Fig. 15" is a detail view of themain rotative wheel illustrating a further modification of its chuck, Fig. 16 is a sectional view thereof, and

Fig. 17 is a, section showing means for holding travel along the same in usual or well known manner.

At 23 (see Fig. 10) is a main driving shaft which passes along within the bed 1 and is suitably su ported, to which motion may be imparted t rough the pulley 7 and gears 5, 6. The shaft 23, by means of suitable keys or feathers, drives'the pinion 3 which may be journaled in a suitable bearing under the head-stock 3, and said shaft also drives a pinion 22 which meshes with the peripheral teeth of wheel 13, which pinion revolves in the lower part of case or frame 17 The head-stock 3 remains fixed in position on bed 1 and the frame 17 with its contained wheel 13 can be shifted along said bed, the distance between the head-stock and the frame 17 being varied according to the length of the crank shaft operated upon.-

The head-stock live-spindle 3 has a gear 3 engaging the pinion 3 on the main shaft 22, and it is of vital im ortance that the gear 3 and rotating wheel 13 should have the same pitch line diameter, the pinions 3 and 22 likewise having the same pitch line diameter; it is also advisable that they should res ectively have the same number of teeth. y providing pinions 3 d and 22 with thesame itch line diameter and gears 3 and 13 then aving also the same pitch line diameter, they being driven by the same main driving shaft 23, the angular velocity of wheel 13 and live-spindle 3 will always be the same.

The chuck provided for live spindle 3 for;

grasping one end of the crank shaft is ar-v ranged as follows Said spindle has a flange or head 3 at its'inner end and to this head is removably secured the chuck 3 which is recessed to -fit accurately over the head 3 to prevent side movement, and. said head and chuck are removably secured together by bolts 3 and dowel pins 3 (see Figs. 2, 2 and 2 The chuck 3 has a lug or projection 3 and on opposite sides thereof are caps or binders 3 which are bolted tothe lug 3 by the bolts 3 and between the lug 3 and the binders 3 clam ing sockets 3 are bored or formed to the (esired sizes to fit a crank shaft, one of said sockets being concentric with live-spindle 3 and the other socket eccentric to the exact amount of the crank throw or to correspond with the axis of the crank pin of the shaft 12. From this it will be observed that with thechuck secured. to

the head 3 of the live-spindle in the proper position and a crank shaft inserted in the eccentric socket, by loosening the bolts 3 the shaft maybe turned orrits axis until any particular crank pin is broughtinto alinement with the axis of rotation of the spindle Lilrewise, when the main bearing portion of the shaft are to be turned or out the end of the crank shaft will be placed in the socket 3 that is concentric with the livespindle 3. When any part of the crank shaft is to be turned or cut, one of its crank arms will be grasped by the chucking devices carried by rotating wheel 13, and by clamping an arm 12 of the crank shaft contiguous to the crank pin 12 that is to be turned the rotational and transverse strains due to the cutting are taken up by the chucking devices while the chuck 3 steadies the crank shaft 12 and insures accuracy of rotation.

The means of clamping the frame or case 17 in any desired position along the bed 1 whereby the frame 17 is kept from distortion when. clamped is a novel part of this invention as illustrated herein, although the arrangement of frame for supporting and guiding wheel 13 may be used as in my said Pa tent No. 568,063, if desired. In the present case the frame 17 is made in halves fastened together by screws 20 (see Fig. .1) whereby the wheel 13 can be inserted and removed from said frame. The bearing surfaces 19 of frame 17 support the journals or hearing surfaces 16 of wheel 13, and the main shaft 23 is journaled in the bearings 26 of frame 17 which are made in two parts or halves and bound together by screws 27.. The upper part of beariru 26 is made integral with rame'17 and the lower part 26 is so constructed that it not only supports the main driving shaft 23 but also acts as a clamp to hold down the frame 17 u on the inner ways 2 of bed 1, as the'outer ed ges 26 bear under the edges 2 of bed 1. This feature is important, as when theouter clamping screws 21 are tightened the tendency is to distort the frame 17 by springing it u in the middle, but=this tendency is effectually resisted bv the screws 27 holding the lower extending bearing portions .26 a ainst the under side 2 of the table or she fof bed 1. (SeeFig. 17.) I 28, 29 are metal guards to retain the oil or grease used on the gearingand to exclude dirt. By

loosening the screws 21 and 27, frame 17 may.

be adjusted along the bed so that the chuck of wheel 13 may grasp a crank arm 12* of any crank of-the axle 12.

he arrangements I have shown for grasp ing a crank arm 12 whereby wheel 13 ma rotate the axle 12 are as follows The we or.plate 15 of wheel 13 is provided with. a

slot or opening l5 through which the axle 12 and its crank arms can '1 pass and within which the crank arms can lie (see Fig. 3.) Said slot or opening is elongated. and extends outwardly across the center of web up to I 1 form to correspond with the transverse outline of the crank arms 12. To firmly chuck or gras crank arm 12' in the proper position for tool-finishing either its pin 12 or its contiguous bearing portion, I provide four chucking j'aws 24, two of which may be fixed while operating on any axle and their two opposing jaws should be adjustable. The plate or web 15 is somewhat thickened around the opening 15 to form a strengthening strip at 25,and abutments 24 are provided to take the chucking strainsi, By means of the wedges 24 the two adjustable chucking jaws 24. are forced against the crank arm 12 binding it to the opposed fixed chucking jaws. The bolts 24 permit the re"- moval of the adjustable abutments 24* when passing the crank shaft 12 through the slot 15 before or after the turning of a crank or bearing surface. 4

The principle of employing two fixed chucking jaws and two opposing adjustable jaws being preserved, the details of construction may be varied, such-as shown in Figs. 12, 13, 14, 15 and 16. The chucking wedges 24 may be incorporated as in Fig. 12 with the chucking jaws 24, and adjusted by tightening the bolts 24, or their equivalents may take the form of a binding screw carrying a washer at its end. hi this latter case the washer is indicated at 21, 24* being the screw and 24 the nut; as a screw is a wedge wrapped around a cylinder, any form of wedge may be modified to tighten the two adjustable jaws.

With the form of chucking devices for gripping the crank arms above set forth, it wil be understood that to make use thereof to the best advantage it is important that the crank arms 12 should all be planed on centers before the crank shaft 12 is introduced into the lat-he for the purpose of milling its pins and bearing surfaces. If the planing is properly done and the crank arms 12 are all exactly in line on their ed es no time need be lost in clamping the crani arms against the fixed chucking jaws 24, but if the edges of the crank arms 12 are unplaned or differ from one another in their symmetrical distances from the axis of the shaft and of the crank pins, it will be necessary to adjust the fixed jaws as well as the adjustable ones every time the position of the crank shaft 12 is the crank pin. In the form of crank arms shown in Fig. 12, however, which are not rectangular in outline, the adjustable jaw 24 is shown bearing against the part 12 of the axle while one of the pins 12 is in line with the axis of rotation of wheel 13; and correspondingly when the part 12 is to be turned the adjustable jaw 24 will correspondingly grip a pin 12*.

A crank shaft 12 having been properly chucked by the respective chucking devices of the rotating Wheel 13 and the head-stock spindle 3 cutting tool 11, which is supported by the relatively thin plate 8 that is secured. to the cross slide 9 of carriage 10, is fed across, under and against the surface to be operated upon. The tool 11 I have shown is of substantially rectangular outline on its cutting faces, and the front cutting face of the tool is presented to the part to be cut at an acute angle to the line of feed under the work or at a tangent with respect to the axis of such part, and said tool is provided with a plurality of cutting or milling edges. In the arrangement shown the cutting tool has at least one cutting edge at a distance below the axis of rotation of the part to be cut equal to the proper radius of the surface when turned, and therefore it is only necessary to feed the tool once across under the work to turn it to the proper diameter. The cutting edges of the sides of the tool engage the opposed. faces of the crank arms 12 and cut the same simultaneously with the cutting of the pin 12 by the inclined cutting edges, and therefore the tool at a single passage across beneath the work cuts the pin or hearing surface to the proper width and diameter and also faces oif the crank arms.

The cross slide 9, carrying the tool support or plate 8 and the tool 11, travels in a suitable guide formed on the upper side of the carriage] 0, and suitable or well known gearing contained in the apron 10" permits-of the rapid adjustment of the carriage 10 along the ways 2 of bed 1 to the desired position where it is temporarily clamped by the bolt 10 acting on the binder 10 which grasps the edge of the bed 1 (see Fig. 1). The splined feed rod 4, located along the front of bed 1, is driven from the end of the headstock spindle 3 by means of ordinary lathe feed gearing (see Fig. 1) and passes through the apron 10, and said shaft by means of a suitable sliding key or feather drives the worm 4 The worm'4 through a worm wheel on the cross feed shaft 4 and suitable connecting gearing through a gear 9 drives a cross feed screw 9 j ournaled on the carriage 1'0 and engaging a nut 9 on cross slide 9 to actuate the latter (see Fig. 6). Such details may be similar to those shown in U. S; Patent No. 444,544, granted to me Jan. 13, 1891, and the carriage. 10 may be adjusted along the bed on ways 2 by means 9f a screw or rack and pinion as shown in' my said patent No. 568,063. By means of the hand rack 9 on plate 8 engages with a pinion 9 wheel 4 in manner well known in the art, a pair of frictions are tightened or loosened to cause the cross feed to start or stop.

The tool supporting late 8 is shown secured upon the cross slic e 9 by screws 8 and said plate carries on its upper edge between the shoulders or lugs 8 the mill 11; said mill is securedto plate 8 by screws 11 a which pass through holes located between the sides of the mill, and said mill is prevented from side movement upon plate 8 by a groove 8 planed on its under side, which overlaps the.

plate 8, (see Fig. 8). Where the width of the mill'll permits it, this groove is'm'ade at least aswide as the thickness of late 8, and where a very wide mill is used t e groove is made wide enough to over-lap the su porting plates 8* which are sustained on late 8 by ins 8 or made integral with p ate 8. In t e latter case the cross 'slide 9 may be equipped with two plates 8, one for narrow mills and one for wide mills, the screws 8 permitting of a rapid interchange of plates. As the mill wears it may be packed up toward the axis of rotation of the work by packing pieces or shims, so that the diameter of the work when the last cutting edge has been fed alon under'it may be of desired size. The num er of cutting edges and amount of stock to be removed by each cutting ed e may be varied to suit the nature of the wor To cheapen the construction of the mill or cutting tool I refer to construct the surface of the upper e ge of plate 8 at such an an le to the direction of the feed movement of t e cross slide 9 that the mill may be of uniform thickness instead of wedge shape laced on a horizontal surface of plate 8, (see igs. 10 and 11). Where the widths of the different bearing surfaces of the crank axle and i the' widths of the crank pins are not all alike, it will be necessary to use a mill no wider than the narrowest bearing; a Wide surface may then be milled by making one out, then moving the carriage 10 along the bed 1 and making another pass of the mill-under the work.

The cross slide 9 is made with concave upwardly extending portions, the length and curvature being such that at the extremities of the travel of the mill, the full swing of the axle is not interfered with. By this construction, the tool sup orting plate 8 is rigidly held against buc ing'strains and its lower edge rests for its whole length sustained by the cross-slide and carriage.

An important modification in the construction of the tool supportin plate 8 is shown in Fig. 9 where said p ate is constructed with dove-tail bearing surfaces 8 sliding in corresponding guides formed in the upwardly extending horns or portions of carriage 10, and thereby the cross slide 9 is in reality merged in the tool supporting plate 8 (see Figs. 9 and 10.) In said figures a for that purpose.

forming part of a vertical shaft 9 which is rotated by a spiral gearing 9 in the apron driven from shaft 4 by suitable gearing. this feeding mechanism corresponding essentially to the parts 9", 9, 9 and 9 in Fig. 6, for operating the cross slide 9. The feeding of plate 8 is started or stopped by a pair of frictions operated by hand wheel 4 on shaft 4 in manner before explained.

Referring to Fig. 1, a foot block 30, carrying the spindle alined with the head-stock spindle 3 adapted to be projected by means of a screw and clamped in position by a binder handle 30 in well known manner, may be mounted upon the ways 2 of bed 1 and secured in its roper position by the usual bolts 30*, and the prolongation of shaft 12 may be turned at the same time its bearings are being milled. By securing suitable centers to the head-stock spindle 3 and foot block spindle 30 work may be turned on centers as in an ordinary lathe. A second carriage 31 with its cross slide 32 and tool post 33 is fed along the bed on the ways 2 by means of suitable gearing operated by a worm carried by splined feed rod 4 produced By means of this construction a tool carried by the post 33 may be caused to operate on the bearing portion of shaft 12 simultaneously with the turning of other bearing portions of said shaft. The

"details for operating the foot block 30 and cross slide 32 bein well known in the art, I have not further il ustrated them as I do not limit my invention to any particular construction of carriage, apron or foot block, nor to the particular construction of headstock, gear-case, feed-gearing or drivinggearing set forth, but for a more full description of such parts I refer to my U. S, Patent No. 568,063, before mentioned. 7

From what has been explained it will be understood that where a multiple-throw crank-shaft is to be turned, the end of the shaft is centered in the eccentric socket 3 of the headstock chuck and one of the crank arms is secured to the rotative wheel 13, and in a four throw crank axle, as shown in Fig. 1., two of its crank pins 12 will be centered at one time, whereby after tool 11 has been assed under a crank in for turning it, rame17 will be shifted along the axle to grip the crank arm of the next corresponding in, and then when that pin has been turned .lt Wlll only be necessary to reverse the positool 11 in all cases making a complete out said member and head together, said memof the size or diameter desired by one passage under the work, simultaneously facing oil. the inner faces of the adjacent crank arms. By the arrangement shown much time and labor are saved in turning multiple-throw crank axles by reason of the fact that for a single adjustment of shaft 12 with respect to the head-stock chuck a number of cuts can be made by tool 11, and furthermore the gripping devices of wheel 13 can be readily ad usted and fastened to the crank arm close to the pin or bearing to be cut or turned, whereby rigidity of support of the crank axle at the point of performing the work is readily effected.

Having now described my invention what I claim is:

1. In a lathe, the combination of a rotativewvheel, a guide for said wheel, means for rotating said wheel, said wheel being pro- I vided with an opening, fixed jaws adjacent to said opening and located at a right angle to each other, two adjustable jaws respec tively opposed tothe fixed jaws, and wedges to co-act with the adjustable jaws whereby the crank arms of a crank axle may be supported and rotated by said wheel, substantially as described.

2. In a crank axle lathe, a chuck comprising a member provided with semi-circular faces, and caps having semi-circular faces forming sockets, with means for securing said caps upon the end of a crank shaft, one of the sockets being concentric with the axis of said member and the other socket eccentric to said axis, substantially as described.

3. In a crank axle lathe, a chuck member provided with a lug and adjustable caps, with means for securing said caps to said lug, said chuck having a socket between the lug and a .cap that is concentric with the axis of the chuck and also having a socket between the lug and a cap that is eccentric to the axis of said chuck, substantially as described.

4. In a lathe chuck, a head, a chuck member removably securedto said head and provided with two clamping sockets for a crank axle, one of which sockets is concentric with the axis of the chuck, and the other of which is eccentric thereto, substantiallyas described.

5. In a lathe, the combination of a spindle provided with a head, of a chuck member provided with a recess on one face to receive said head, means for detachably securing l i l I i l l l and means located within the p berhaving a clamping socket that is concentric to the axis of the spindle and another clamping socket that is eccentric to the axis of the spindle, substantially as described.

6. In a lathe, the combination of means for supporting and rotating a crank axle, with-a carriage provided with a support for a tool movable transversely of the lathe bed, a tool mounted on said su port and wider than the latter and provider with. a .lurality of cutting edges, and means located planes of the sides of the tool for securing the tool 11 on its support, substantially as de scribed 7. In a lathe, the combination of means for supporting and rotating a crank axle, with a carriage provided with a sup ort for a tool movable transversely of the athe bed, and

a tool mounted on said sugpport and wider than the latter and provide with a plurality of cutting edges on one face located on a plane parallel to the axis of the work, and also having cutting edges on op osite sides, anes of the sides of the tool for securing e tool upon said support, substantially as described.

8. In a lathe, the combination of means for supporting and rotating a crank axle, with a carriage provided with a su port for a tool movable transversely of the athe bed, and a tool provided with a groove on its under side mounted upon said support so that the extensions of the tool over-lap the edges of the support, .said tool being rovided with cu-tting edges located on a p ane parallel to the axis of rotation of the work and oblique to the plane of movement of the support, substantially as described.

9. In a lathe, the combination of means for supporting and rotating a crank axle, with a carriage provided with a sup ort for a tool movable transversely of the athe bed, and a tool provided with a groove on its under side mounted upon said sup ort so that the extensions of the tool overap the edges of the support, said tool being provided with cutting edges located on a plane parallel to the axis of rotation of the work and oblique to the plane of movement .of the sup ort, and means located between the sides of the tool for securing the tool upon its support, substantially as described.

. JOHN L. BOGERT.

Witnesses: r

T. F. BOURNE, M. HOLLINGSHEAD. 

